Stearic acid, namely octadecanoic acid, has a simple structural formula: CH3(CH2)16COOH, which is produced by the crystallization of fats and oils and is mainly used for the production of stearates. Each gram is dissolved in 21ml ethanol, 5m...

Roller bearing is a kind of ball bearing , and it is one of the parts widely used in modern machinery. It relies on the rolling contact between the main components to support the rotating parts. Roll...

First, when the bearing is removed for inspection, first use photography and other methods to record the appearance. In addition, confirm the amount of remaining lubricant and sample the lubricant bef...